Charles a



(No Model.)

G. A. EVARTS.

GENTRAL DRAFT LAMP. No. 432,264. Patented July 15, 1890.

NITED STATES PATENT Orricm CHARLES A. EVARTS, OF MERIDEN, CONNECTICUT,ASSIGNOR TO THE BRAD- LEY & HUBBARD MANUFACTURING COMPANY, OF SAMEPLACE.

CENTRAL-DRAFT LAM P.

SPECIFICATION forming part of Letters Patent No. 432,264, dated July 15,1890.

Application filed December 30, 1889- Serial No. 335,351. (No model.)

To all whom it may concern: a bearing therein, and so as to support theBe it known that I,'CHARLEs A. EVARTS, shaft in its proper position. Inthis class of of Meriden, in the county of New Haven and lamps therewill unavoidably be more or less State of Connecticut, have invented anew fiber escape from the wick and settle at the Improvement inick-Adjusters for Centralbottom of the fount. Owing to this collection 55 Draft Lamps; and Ido herebydeclare the folin the bottom of the fount,a difficulty is exlowing, when taken in connection with accomperiencedin this class of adjusters from the panyin g drawings, andthe letters ofreference fact that the termination of the thread above marked thereon,to bea full, clear, and exact the bottom of the fount and unprotected 1odescription of the same, and which said drawcatches such sediment, andin the rotation of in gs constitute part of this specification, and thescrew will cause it to work up on the thread represent, in of the screwand to clog the nut to a greater Figure 1, a vertical central section ofthe or less extent. In many cases this is a serious fount, showing aside view of the wick-addifficulty. To overcome this difliculty, I in-15 justing shaft and its operating-shaft; Fig. 2, close the lower end ofthe screw-thread by a a top View of the same. cup-shaped collar fithiscollar being arranged This invention relates to an improvement above thebottom of the fount and 011 the inthat class of wick-adjusters forcentral-draft bearing in which the shaft is supported. It lamps in whichthe wick-adj usteris operated so incloses the lower end of the thread asto 20 by a vertical endless screw supported in the prevent thepossibility of its engaging the fount, and so that by the rotation ofthe said sediment which may lie upon or near the botscrew thewick-adjuster will be raised or lowtom of the fount. cred, according tothe direction in which the C represents the operating-shaft. It isarscrew is turned, the invention being particuranged through a tube D,which extends ver- 2 5 larly adapted to those adjusters of this classtically from the top to the bottom of the fount in which a Verticalshaft is arranged through and open both at the top and bottom. Upon thefount parallel with the screw, the shaft the lower end of the shaft C asuitable head'E extending through the fount and provided is arranged bywhich the shaft 0 may be rowithaknob below, by which it may be rotated,tated. At its upper end the shaft C carries 0 the shaft andthe screwgeared together above a gear F, which works into a corresponding thefount; and the invention consists in the gear Gon the screw-shaft and sothat the roconstruction as hereinafter described, and tation of theshaft C will impart correspondparticularly recited in the claims. ingrotation to the adj Listing-screw. The col- A represents the fount,which is of usual lar g rests upon the top of the tubular bearing 5construction, not necessary to be shown in 6 so as to support thescrewagainst downdetail. The vertical endless screw is comward movement.To support it against upposed of a shaft a,with a wire thread I) coiledward movement, a collar 9 is arranged bearound it and made fast to theshaft so as to neath the gear G on the screw-shaft, and of revolve withit, that the said spiral wire may somewhat larger diameter than thegear, or

40 serve as a screw-thread, and which, working so as to extend beneaththe gear F of the shaft in the nut portion B of the wick-adjuster, willC, as seen in Fig. 1, and so that this collar will cause that adjusterto rise or fall, according takeabearing upon the under side of the gearto the direction in which the screw is turned. F, and thereby preventthe rising of the screw- The screw is supported in a suitable bearingshaft. The operating-shaft being supported,

45 (Z at the lower end and in a bearing 6 at the as shown, againsteither up or down moveupper end. As here represented this upper ment, itfollows that the screw-shaft is also bearing is a tube made fast in thetop of the prevented from verticalfmovement. fount and of an internaldiameter correspond- For the purpose of assembling the parts, the ing tothe internal diameter of the screwhead E is removable from the shaft 0,and

550 thread, and so that the screw-thread will take when so removed theshaft C may be drawn u pward from the fount, and then the adjustingscrewis free to be drawn from the fount in like manner.

To secure the gear G to the screw-shaftg as well as to secure the spiralwire thread to the shaft, and so as to prevent the rotation of thescrew-shaft independent of the screw-thread, the Wire of the thread atits upper end is turned laterally around the scre\v-shaft,as seen at It,and so as to form a collar around the shaft and, as seen in Fig. 2, thiscollar portion of the wire thread may be closed so lirm 1y around theshaftas to seen re the wire to its shaft; but I prefer to add solderbetween the shaft and this collar portion of the wire, it beingunderstood that the screw-thread portion of the wire is simply coiledaround the shaft and requires no other attachment to the shaft than thatgiven by closing the wire around the upper portion of the shaft, asdescribed. The

wire thread also serves to secure the gear G upon the shaft, the wirebeing first passed vertically through a hole in the gear G, as at 11.(See Fig. 1.)

The method which I have described for 1111 i ting the wire thread to itsshaft may be embined with a stationary cup-shaped collar f around thelower end of the screw-thread, substantially as described.

2. In a Wickadjuster for centraldraft lamps, the wick-adjusting screwcomposed of the vertical shaft a and the spiral wire thread I), a gear Gon said screw-shaft at-its upper end, the upper end of the wire of whichthe screw is formed extending verticallythrough a corresponding hole inthe gear, with a vertieal shaft 0 and gear F correspom'ling to the gearG, substantially as described.

CHARLES A. EVARTS.

\Vitnesses:

l 15. FAIRBANKS, A. E. IIALL.

